Video broken on OS X

Attempted to initiate a video call on OS X, it hung without crashing until I issued a SIGSTOP

Log:

Process 32203 launched: '/Applications/qtox.app/Contents/MacOS/qtox' (x86_64)  
built on:  09:42:08 Oct 20 2014  
commit:  a2adc5edae6629b761191556bb6a5050e9c28323 

Settings: Loading from  "/Users/sean/Library/Preferences/tox/settings.ini"  
Using embeded bootstrap nodes list  
Error loading translation "en"  
Core: loading Tox from "/Users/sean/Library/Preferences/tox/sean.tox"  
QFSFileEngine::open: No file name specified  
Core starting with IPv6 enabled  
Core::loadConfiguration: reading from  "/Users/sean/Library/Preferences/tox/sean.tox"  
Widget: Adding friend with id "EBA1382262B7C464BC6049935436D9A3F5A0AA3A196C1C53102322CDE598FB0C"  
Widget: Adding friend with id "29AE62F95C56063D833024B1CB5C2140DC4AEB94A80FF4596CACC460D7BAA062"  
Widget: Adding friend with id "56A1ADE4B65B86BCD51CC73E2CD4E542179F47959FE3E0E21B4B0ACDADE51855"  
Widget: Adding friend with id "371F97372F61172E84695800A483CF098C56968E60B7C72B20D7B7176B774865"  
Widget: loadded avatar for id "371F97372F61172E84695800A483CF098C56968E60B7C72B20D7B7176B774865"  
Widget: Adding friend with id "BF9A09F70D6C0C3424472B740E9F70878A72CECCB30AC396D60D8160BB6C2E22"  
Widget: Adding friend with id "9FD9944C1B4C2B48150D3B9759605FDE6032082AC4E75F1EBEBF8ED427D02E57"  
Widget: loadded avatar for id "9FD9944C1B4C2B48150D3B9759605FDE6032082AC4E75F1EBEBF8ED427D02E57"  
Widget: Adding friend with id "E5809EEF5F11AB29B9BDF543C05B58DDF454AB9CA176C235C7699FDC2757DC33"  
Widget: loadded avatar for id "E5809EEF5F11AB29B9BDF543C05B58DDF454AB9CA176C235C7699FDC2757DC33"  
Widget: Adding friend with id "7119F8F3B55FCA07F78CC78003F9F9FCE70B2C0AEF3649F3A84C87EA56BE927F"  
Widget: loadded avatar for id "7119F8F3B55FCA07F78CC78003F9F9FCE70B2C0AEF3649F3A84C87EA56BE927F"  
Widget: Adding friend with id "89672CE0824AA1FF43FC6649BB6ED301FD161177D2A0E06C88198B688D431D2A"  
Core: Bootstraping to the DHT ...  
"Core: Bootstraping from Proplex, addr 107.161.17.51, port 33445"
"Core: Bootstraping from SylvieLorxu, addr 178.21.112.187, port 33445"
Core: Connected to DHT  
Settings: Saving in  "/Users/sean/Library/Preferences/tox/settings.ini"  
Core: writing tox_save to  "/Users/sean/Library/Preferences/tox/sean.tox"  
Cleaned up camera.  
(QSize(1280, 720) ,  QSize(320, 240) ,  QSize(640, 480) ) 
Core: Got null avatar info from "audiobotze"  
Core: Got null avatar info from "GroupBot"

Core: Got null avatar info from " "  
VideoSurface: Init  
QOpenGLShader::compile(Fragment): ERROR: 0:4: '-' does not operate on 'vec4' and 'vec3'  
ERROR: 0:4: Use of undeclared identifier 'yuv'  
ERROR: 0:4: Use of undeclared identifier 'rgb'

*** Problematic Fragment shader source code ***
#define lowp
#define mediump
#define highp
uniform sampler2D texture0;varying vec2 coords;void main() {      vec3 yuv = texture2D(texture0,coords*vec2(1.0, -1.0)) - vec3(0,0.5,0.5);      vec3 rgb = mat3(1,1,1,0,-0.21482,2.12798,1.28033,-0.38059,0) * yuv;      gl_FragColor = vec4(rgb,1);}

***
CameraWorker: Resume  
Process 32203 stopped  
* thread [#1](/projects/123754/tickets/1 "Ticket #1"): tid = 0x90c4d, 0x00007fff8d587132 libsystem_kernel.dylib`__psynch_cvwait + 10, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
    frame [#0](/projects/123754/tickets/0 "Ticket #0"): 0x00007fff8d587132 libsystem_kernel.dylib`__psynch_cvwait + 10
libsystem_kernel.dylib`__psynch_cvwait + 10:  
-> 0x7fff8d587132:  jae    0x7fff8d58713c            ; __psynch_cvwait + 20
   0x7fff8d587134:  movq   %rax, %rdi
   0x7fff8d587137:  jmp    0x7fff8d582ca3            ; cerror_nocancel
   0x7fff8d58713c:  retq

Backtrace:

* thread [#1](/projects/123754/tickets/1 "Ticket #1"): tid = 0x90c4d, 0x00007fff8d587132 libsystem_kernel.dylib`__psynch_cvwait + 10, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
  * frame [#0](/projects/123754/tickets/0 "Ticket #0"): 0x00007fff8d587132 libsystem_kernel.dylib`__psynch_cvwait + 10
    frame [#1](/projects/123754/tickets/1 "Ticket #1"): 0x00007fff8df8fea0 libsystem_pthread.dylib`_pthread_cond_wait + 693
    frame [#2](/projects/123754/tickets/2 "Ticket #2"): 0x00000001011bacab QtCore`___lldb_unnamed_function389$$QtCore + 75
    frame [#3](/projects/123754/tickets/3 "Ticket #3"): 0x00000001011bab48 QtCore`QWaitCondition::wait(QMutex*, unsigned long) + 168
    frame [#4](/projects/123754/tickets/4 "Ticket #4"): 0x00000001011b4b3f QtCore`QSemaphore::acquire(int) + 79
    frame [#5](/projects/123754/tickets/5 "Ticket #5"): 0x00000001013b8e30 QtCore`QMetaMethod::invoke(QObject*, Qt::ConnectionType, QGenericReturnArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument) const + 1280
    frame [#6](/projects/123754/tickets/6 "Ticket #6"): 0x00000001013b87d1 QtCore`QMetaObject::invokeMethod(QObject*, char const*, Qt::ConnectionType, QGenericReturnArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument) + 2097
    frame [#7](/projects/123754/tickets/7 "Ticket #7"): 0x00000001000869f6 qtox`CameraWorker::getProp(int) + 326
    frame [#8](/projects/123754/tickets/8 "Ticket #8"): 0x000000010001de41 qtox`AVForm::present() + 865
    frame [#9](/projects/123754/tickets/9 "Ticket #9"): 0x0000000100010605 qtox`SettingsWidget::onTabChanged(int) + 53
    frame [#10](/projects/123754/tickets/10 "Ticket #10"): 0x00000001013e0e15 QtCore`QMetaObject::activate(QObject*, int, int, void**) + 2341
    frame [#11](/projects/123754/tickets/11 "Ticket #11"): 0x0000000100845edf QtWidgets`___lldb_unnamed_function2446$$QtWidgets + 671
    frame [#12](/projects/123754/tickets/12 "Ticket #12"): 0x00000001013e075a QtCore`QMetaObject::activate(QObject*, int, int, void**) + 618
    frame [#13](/projects/123754/tickets/13 "Ticket #13"): 0x000000010083d811 QtWidgets`QTabBar::setCurrentIndex(int) + 401
    frame [#14](/projects/123754/tickets/14 "Ticket #14"): 0x0000000100840dc1 QtWidgets`QTabBar::mousePressEvent(QMouseEvent*) + 673
    frame [#15](/projects/123754/tickets/15 "Ticket #15"): 0x00000001006f69ed QtWidgets`QWidget::event(QEvent*) + 1469
    frame [#16](/projects/123754/tickets/16 "Ticket #16"): 0x000000010083f60d QtWidgets`QTabBar::event(QEvent*) + 893
    frame [#17](/projects/123754/tickets/17 "Ticket #17"): 0x00000001006bbeac QtWidgets`QApplicationPrivate::notify_helper(QObject*, QEvent*) + 252
    frame [#18](/projects/123754/tickets/18 "Ticket #18"): 0x00000001006bf5ed QtWidgets`QApplication::notify(QObject*, QEvent*) + 9357
    frame [#19](/projects/123754/tickets/19 "Ticket #19"): 0x00000001013af623 QtCore`QCoreApplication::notifyInternal(QObject*, QEvent*) + 115
    frame [#20](/projects/123754/tickets/20 "Ticket #20"): 0x00000001006bc758 QtWidgets`QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) + 904
    frame [#21](/projects/123754/tickets/21 "Ticket #21"): 0x0000000100714dec QtWidgets`___lldb_unnamed_function617$$QtWidgets + 1196
    frame [#22](/projects/123754/tickets/22 "Ticket #22"): 0x0000000100714052 QtWidgets`___lldb_unnamed_function612$$QtWidgets + 114
    frame [#23](/projects/123754/tickets/23 "Ticket #23"): 0x00000001006bbeac QtWidgets`QApplicationPrivate::notify_helper(QObject*, QEvent*) + 252
    frame [#24](/projects/123754/tickets/24 "Ticket #24"): 0x00000001006bd57a QtWidgets`QApplication::notify(QObject*, QEvent*) + 1050
    frame [#25](/projects/123754/tickets/25 "Ticket #25"): 0x00000001013af623 QtCore`QCoreApplication::notifyInternal(QObject*, QEvent*) + 115
    frame [#26](/projects/123754/tickets/26 "Ticket #26"): 0x0000000100ca0397 QtGui`QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) + 2151
    frame [#27](/projects/123754/tickets/27 "Ticket #27"): 0x0000000100c9f266 QtGui`QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) + 118
    frame [#28](/projects/123754/tickets/28 "Ticket #28"): 0x0000000100c8d9aa QtGui`QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 346
    frame [#29](/projects/123754/tickets/29 "Ticket #29"): 0x0000000102d2c141 libqcocoa.dylib`___lldb_unnamed_function461$$libqcocoa.dylib + 33
    frame [#30](/projects/123754/tickets/30 "Ticket #30"): 0x00007fff90591661 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
    frame [#31](/projects/123754/tickets/31 "Ticket #31"): 0x00007fff905837ed CoreFoundation`__CFRunLoopDoSources0 + 269
    frame [#32](/projects/123754/tickets/32 "Ticket #32"): 0x00007fff90582e1f CoreFoundation`__CFRunLoopRun + 927
    frame [#33](/projects/123754/tickets/33 "Ticket #33"): 0x00007fff90582838 CoreFoundation`CFRunLoopRunSpecific + 296
    frame [#34](/projects/123754/tickets/34 "Ticket #34"): 0x00007fff8d24d43f HIToolbox`RunCurrentEventLoopInMode + 235
    frame [#35](/projects/123754/tickets/35 "Ticket #35"): 0x00007fff8d24d0be HIToolbox`ReceiveNextEventCommon + 179
    frame [#36](/projects/123754/tickets/36 "Ticket #36"): 0x00007fff8d24cffb HIToolbox`_BlockUntilNextEventMatchingListInModeWithFilter + 71
    frame [#37](/projects/123754/tickets/37 "Ticket #37"): 0x00007fff909cd821 AppKit`_DPSNextEvent + 964
    frame [#38](/projects/123754/tickets/38 "Ticket #38"): 0x00007fff909ccfd0 AppKit`-[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 194
    frame [#39](/projects/123754/tickets/39 "Ticket #39"): 0x00007fff909c0f73 AppKit`-[NSApplication run] + 594
    frame [#40](/projects/123754/tickets/40 "Ticket #40"): 0x0000000102d2aff5 libqcocoa.dylib`___lldb_unnamed_function442$$libqcocoa.dylib + 2165
    frame [#41](/projects/123754/tickets/41 "Ticket #41"): 0x00000001013acd0d QtCore`QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 381
    frame [#42](/projects/123754/tickets/42 "Ticket #42"): 0x00000001013afc0c QtCore`QCoreApplication::exec() + 364
    frame [#43](/projects/123754/tickets/43 "Ticket #43"): 0x000000010005044f qtox`main + 2191
    frame [#44](/projects/123754/tickets/44 "Ticket #44"): 0x0000000100005b84 qtox`start + 52

I can produce more lldb data if needed, though I've been unable to get it to crash directly.